Moved play-java[-ebean] and play-scala[-anorm] into one play2 directory

All these tests use Play 2.3. Setup and configuration is standardised and
generated by the `generate_config.py` script. In the future some of the
other Play 2 tests could be moved into this directory.
DO NOT MERGE: Disable all travis tests except play2
DO NOT MERGE: Run all tests (only play2 anyway)